Cell‐Based Optimization of Covalent Reversible Ketoamide Inhibitors Bridging the Unprimed to the Primed Site of the Proteasome β5 Subunit
作者:Daniel Stubba、Dennis Bensinger、Janika Steinbacher、Lilia Proskurjakov、Álvaro Salcedo Gómez、Uwe Schmidt、Stefan Roth、Katja Schmitz、Boris Schmidt
DOI:10.1002/cmdc.201900472
日期:2019.12.4
boronates, optimization of novel covalent-reversibly binding warheads remains largely unattended. We previously reported α-ketoamides to be a promising reversible lead motif, yet the cytotoxic activity required further optimization. This work focuses on the lead optimization of phenoxy-substituted α-ketoamides combining the structure-activity relationships from the primed and the non-primed site of the
泛素-蛋白酶体系统(UPS)是已批准的治疗特定血液系统恶性肿瘤药物的既定治疗靶标。虽然针对UPS的药物发现侧重于不可逆结合的环氧酮和缓慢可逆结合的硼酸酯,但新型共价可逆结合弹头的优化在很大程度上无人值守。我们之前曾报道过α-酮酰胺是一种有前途的可逆铅基序,但其细胞毒性活性需要进一步优化。这项工作着眼于苯氧基取代的α-酮酰胺的前导优化,结合了蛋白酶体β5亚基的引发和未引发位点之间的结构-活性关系。我们的优化策略伴随着分子建模,表明P1'被占领 通过3-苯氧基团增加白血病细胞系中β5的抑制作用和细胞毒活性。进一步分析关键化合物的时间依赖性抑制细胞底物转化。此外,与硼替佐米相反,α-酮酰胺前导结构27不会影响Danio rerio胚胎的逃避反应行为,这表明靶标特异性增加。